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Full text of "Flora Indica Vol-I"

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246                                      FLORA   INJHCA-
island of Cheduba, and if so, the latter is the northern limit
of that tree.
The sources of the river Irawadi are, according to the best
authorities, between 27 and 28 of norili latitude, and the
direction of its valley is nearly due north and south. The
mountains in which this immense river takes its rise probably
rival in height the Eastern Himalaya, but the meridional
ranges which bound its valley on each side do not long re-
tain any great elevation, though they are continuously from
4000 to 8000 feet in height almost as far as the sea. The
transverse range, which separates the upper part of the west-
ern branch of the Irawadi from the valley of Assam, is also
of moderate elevation, varying probably between 5000 and
6000 feet.
The slope of the valley of the Irawadi is greater than that
of the Indus or Granges, if the estimates of elevation given by
Griffith may be relied on. The valley of Hukum is stated to
be 1000 feet above the level of the sea. The determination
however was made by boiling water, which, at such low levels,
is too fallacious a test to be depended on. The central branch
of the Irawadi, at Manchi in 27a 20* north latitude, where it
was visited by Wilcox, has an elevation of 1800 feet*, and
runs over a pebbly bed. Its elevation at Bhaumo, in lat.
24, is estimated by the same authority to be about 500 feet.
The valley of the Irawadi is much less open than that of
the Ganges, being interrupted in many places by transverse
ranges. In the upper part of its course these are numerous,
aud the lateral valleys they enclose are comparatively small;
but lower down there is a great expanse of level country,
though the hills occasionally attain au elevation of 8000 or
iOOO feet close to the river.
The direction of the monsoon wind in the valley of the
Irawadi appear** to be nearly from south to north. The
* As, Ites. xvii. 441.